Microstructure, mechanical and tribological properties of A390/SiC composite produced by compocasting  

复合铸造A390/SiC复合材料的显微组织、力学和摩擦学性能（英文）

作　　者：Javad MOHAMADIGANGARAJ Salman NOUROUZI Hamed JAMSHIDI AVAL 

机构地区：[1]Department of Materials Engineering, Babol Noshirvani University of Technology

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第4期710-721,共12页中国有色金属学报（英文版）

摘　　要：Aluminum A390 alloys reinforced with 10 wt.%SiC composite,were produced by the compocasting method.The effects of temperature,time,and stirring speed of this compocasting method on the microstructure,mechanical and tribological properties of composite were investigated.The results indicated that with increasing the rotational speed from 450 to 550 r/min,the distribution of the SiC particles becomes more uniform.A sudden increase in porosity due to gas absorption results in a downtrend of elongation with an increase in stirring speed from 550 to 650 r/min.Furthermore,as the stirring time increases,the amount of agglomerates of primary Si particles is reduced,and a more uniform microstructure of SiC and Si particles is formed.Although the fracture mode is a combination of both brittle and ductile fractures,the main mechanism of the fracture in the compocast sample is ductile.The formation of a protective layer at a high temperature can result in a very low wear rate as compared to a wear test performed at a low temperature.Optimal particle uniformity and mechanical properties were obtained at processing parameters of 610刟C,550 r/min,and 20 min.采用复合铸造法制备10 wt.%SiC增强的A390铝合金复合材料。研究复合铸造的温度、时间和搅拌速度对复合材料显微组织、力学性能和摩擦学性能的影响。结果表明,当转速从450提高到550r/min时,碳化硅颗粒的分布更加均匀。由于气体的吸收,材料的孔隙率突然增大,导致随着搅拌速度从550增加到650r/min时,伸长率下降。此外,随着搅拌时间的增加,原始硅颗粒团聚体的数量减少,显微组织中碳化硅和硅颗粒分布更加均匀。虽然复合铸造试样的断裂模式是脆性断裂和韧性断裂的复合,但其主要断裂机理是韧性断裂。与低温磨损试验相比,在高温下材料摩擦表面形成的保护层可导致极低的磨损率。得到最佳的颗粒均匀性和力学性能的工艺参数为:610°C、550 r/min和20 min。

关 键 词：A390/SiC compocasting COMPOSITE MICROSTRUCTURE SiC particles 

分 类 号：TB33[一般工业技术—材料科学与工程] TG249[金属学及工艺—铸造]